BGE - Model is white instead of it's given textures
I can guess only, but maybe the 3D view is in solid shading mode. Try to switch to textured mode, you should see textures then.

So, change the mode from



which results in:



to:



which results in:



EDIT: After seeing your file, I think the behavior you described comes from another few problems:


The ground material's Emit setting is set to 2, which makes the material emissive and therefore it's not interacting with lamps.
There are no lamps in the scene.
The texture on the ground plane is just plain white, you can just use the material color for that. The player object has that texture too.